It’s hard to say exactly when it happened, but Halloween has undisputedly crept up on us to become a big league holiday. The kind where preparations begin over a month in advance, with horror movie marathons, costume discussions, and decorations. With that in mind, it would be a grave mistake to go in ill-prepared, so we’re here to do our part to help ring in the festivities. Here are four spooky games that will have horror-lovers shambling on over to the App Store and coffin’ up their dough.

The RoomPerhaps not the most obvious pick at first, The Room makes up for a lack of blood and gore with an ample amount of atmospheric tension. What starts off as Myst-like series of interlocking, symbol-filled puzzles soon emerges as an implied storyline filled with spine-tingling mystery. Much goes unsaid, but plumbing the depths of the unknown backed by eerie music box chimes is a meticulous thrill all its own.

$0.99

Papa SangreFrom one nontypical experience to the next, Papa Sangre is a video game with no...video? Tasked with saving the soul of a loved one, players will take a frequently terrifying first-person audio journey through the palace of the titular demon. With an elegant interface and gripping story, Papa Sangre is a truly unique title that speaks to the power of sensory deprivation. The horrifying, horrifying power.

$4.99

The Walking DeadFor a game filled with zombies, The Walking Dead’s horror derives almost entirely from the heart-breaking failings of humankind. Telltell Games has earned a mausoleum full of critical praise for its serialized interpretation of Robert Kirman’s graphic graphic novel, which uses the point and click adventure genre to force players to make tough, lasting decisions about life, death, and the brainless hereafter. All episodes can be purchased from within the app, so start this gripping tale right now.

FREE!

Dead SpaceAs far as mobile horror goes, this one may be an oldie, but it’s most definitely a goodie. One of the best, in fact. Not only is it a faithful translation of Visceral Games’ flagship survival horror series to the small screen, but this version may just be scarier. In a dark room, with headphones in, the game’s brilliant tension between all-out action and edge-of-the-seat inaction is brought to the forefront, all backed by a methodical, shriek-worthy soundtrack. Player beware: Necromorphs may induce device dropping. (iPhone version also available.)